diff --git a/test/notmuch-test b/test/notmuch-test
index a861df16..ca414089 100755
--- a/test/notmuch-test
+++ b/test/notmuch-test
@@ -798,6 +798,22 @@ References: <${gen_msg_id}>
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > Un-munging Reply-To"
 
+printf " Message with header of exactly 200 bytes...\t"
+
+add_message '[subject]="This subject is exactly 200 bytes in length. Other than its length there is not much of note here. Note that the length of 200 bytes includes the Subject: and Re: prefixes with two spaces"' \
+            '[date]="Tue, 05 Jan 2010 15:43:56 -0800"' \
+            '[body]="200-byte header"'
+
+output=$($NOTMUCH reply id:${gen_msg_id})
+pass_if_equal "$output" "From: Notmuch Test Suite <test_suite@notmuchmail.org>
+Subject: Re: This subject is exactly 200 bytes in length. Other than its length there is not much of note here. Note that the length of 200 bytes includes the Subject: and Re: prefixes with two spaces
+Bcc: test_suite@notmuchmail.org
+In-Reply-To: <${gen_msg_id}>
+References: <${gen_msg_id}>
+
+On Tue, 05 Jan 2010 15:43:56 -0800, Notmuch Test Suite <test_suite@notmuchmail.org> wrote:
+> 200-byte header"
+
 printf "\nTesting handling of uuencoded data:\n"
 
 add_message [subject]=uuencodetest '[date]="Sat, 01 Jan 2000 12:00:00 -0000"' \